Becoming a baby daddy typically (though not always) requires a male orgasm, and so for a male to bring about an orgasm on his own could count as practicing for the eventual orgasm that will result in baby daddy-hood.
A guy who is a lousy father, who gots one or more kids with one or more chicks and, thinks he's a pimp. And instead of takin care of the baby he goes out an finds another chick to fuck. Until she too becomes just another baby's momma and he moves on. So on and so forth.